When will Rey Mysterio return to the WWE?

In a tweet coming out from Rey Mysterio.  He said that he is hoping to be back by Summerslam!  This is really exciting news because Rey Mysterio he needs to come back and possibly win another World title or Intercontintal championship.  But Rey Mysterio could possibly win another Royal Rumble or at WrestleMania!  Rey Mysterio has not been at WrestleMania since 2011 which is a really long time!  But his last ppv event was this year in the Royal Rumble match.  So hopefully by Summerslam we will see Rey Mysterio!